128815031 has 2 divisors, whose sum is σ = 128815032. Its totient is φ = 128815030.

The previous prime is 128815021. The next prime is 128815067. The reversal of 128815031 is 130518821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128815031 - 2¹⁸ = 128552887 is a prime.

It is a super-2 number, since 2×128815031² = 33186624423061922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128814985 and 128815003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128815021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64407515 + 64407516.

It is an arithmetic number, because the mean of its divisors is an integer number (64407516).

Almost surely, 2^128815031 is an apocalyptic number.

128815031 is a deficient number, since it is larger than the sum of its proper divisors (1).

128815031 is an equidigital number, since it uses as much as digits as its factorization.

128815031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 128815031 is about 11349.6709643936. The cubic root of 128815031 is about 505.0358187841.

The spelling of 128815031 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, thirty-one".